. No matter where you are, stay connected whether you’re owning that virtual meeting or catching up with a friend; After that , when you toggle the on switch on the headphone located on the right cup, immediately you will notice the background noise to cancel out almost 70%. from venturebeat.com Just a note regarding serial numbers, there are 3 different serial numbers: As i am in an office of my own, and there is little background noise to actually cancel out, i can't judge how effective the noise cancelling is. And once the music starts playing, you're completely isolated in your own world.